The Aberrant Strain is a sickly yellow themed strain that occurs only through player interference. These xenomorphs only occur when a player reduces a previous strains genetic integrity to -3.0. They are only avaliable through also having the AvP : Humans module.
Aberrants are an intentionally weakened strain of xenomorph. Not only are their senses heavily dulled their hive abilities and more are lessened to a major degree.
This strain lacks any unique abilities, however due to it occurring through player interference its genetics will usually be scrambled resulting in it being incredibly strong, medium or very weak. Because of this, when creating Aberrants players can abuse this to intentionally create very farmable Aberrant Hives to gain specific xeno related resources.
The Aberrants lack anything new for their blood, instead it acts only as regular acidic blood from the base strain.
For Example,

An Aberrant Praetorian.
Aberrants can occur through lightning striking an ovomorph. This still is through player interference but wont result in unique genetics.